Portable steam-boiler



2 Sheets-Sheet 1.

(No Model.)

G. SELDEN.

PORTABLE STEAM BOILER.

No. 249,683. Patented Nov. 15,1881.

N. PETERS. PholwLilhngrapllen Wnshinglom RC (No Model.)

Patented Nov. 15,1881.

N. PETERS. Plwlo-Lllhogmphcr. \Vnilungtml. n c.

NITEE STATES ATENT rare.

PORTABLE STEAM-BOILER.

SPECIFICATION forming part of Letters Patent No. 249,683, dated November 15, 1881.

Application filed July 16, 1881.

To all whom it may concern Be it known that I, GEORGE SELDEN, of Erie, county of Erie, State of Pennsylvania, have invented new and useful Improvements in Portable Steam-Boilers, of which the following is a full, clear, and exact description, reference being had to theaccompanying drawings, making part of this specification, in which- Figure l is a perspective view of my improved boiler, showing the furnace or fire-pot detached. Fig. 2 is a vertical longitudinal section through the boiler and furnace united. Fig. 3 is a perspective view of the rear end of the fire-pot detached, and Fig. 4 is a vertical transverse section through the same.

Myinvention relates to a novel construction of a horizontal portable steam-boiler, and of the detachable furnace or lire-pot connected therewith whereby the boiler and fire-pot can be not only readily detached from each other for transportation and again reunited without the necessity of employing skilled labor for that purpose, but the fire-pot itself can be readily taken to pieces for facilitating its transportation; also, to the manner of forming the joints between the boiler and the fire-pot, and the arrangement of the lining of the latter relative to said joints, whereby they are covered and protected from the direct action of the fire, and to the manner of forming a hot-air chamber in the fire-pot, and of superheating therein the steam communicating with the safety-valve, all as hereinafter explained.

In the accompanying drawings, A represents the boiler,which is of the horizontal multitubular type, and which, together with the smoke-box or breeching A, except in the particulars hereinafter specifically pointed out, may be of any usual or preferred form or construction.

B is the forward tube-sheet, made in the form of a perforated disk, having a peripherical flange, 1), formed on its rear face, of sufflcient width or depth not only to permit the forward end of the boiler-cylinder to be riveted or otherwise properly secured to its rear edge, but to also permit the upper portion of the furnace or fire-pot O, conforming in shape thereto, to be bolted to said flange with its rear end abutting against the forward end of the upper portion of the boiler-cylinder, as shown in Fig.

(N0 model.)

2. The shell of the fire-pot, below the central line of the boiler, instead of following the circle thereof, is extended downward in rightlines to form the sides of the fire-pot, and where a closed ash-pit is desired may be made to extend below the grate-line and turned horizontally across underneath the same to form the bottom of said ash-pit, as indicated by the dotted lines in Figs. 1 and 4. These vertical sides are extended at their rear ends, 0 c, slightly beyond the arching top or upper part of the fire-pot, so as to overlap the rivets uniting the boiler-shell to the flanged head or tubesheet, and are connected by a vertical end plate, D, which on its upper edge is curved or made concave to conform in shape to the lower part of the boiler shell or cylinder. This end plate is provided on said upper concave edge with a rearwardly-projecting flange, cl, through which it is adapted to be bolted to the shell of the boiler in rear of the rivets connecting the shell or cylinder with the flanged head or tubesheet, and the vertical ends of said plate have forwardly-projecting flanges 61, through which said plate is bolted or riveted to the side walls of the fire-pot at its rear end, as shown in Fig. 3. This rear wall-plate, D, of the fire-pot extends down the same distance as the sidewalls, and where the latter are extended to form an ash-pit, as suggested, the lower edge of said plate will be provided with a forwardly-projecting flange, through which to rivet or otherwise fasten the bottom wall of the ash-pit to it. The front plate or wall, D, of the firepot is provided with an inwardly-projecting flange on its edges, through which it is bolted to the side walls and top of the fire-pot shell, and also to the flooring of the closed ash-pit, where the latter is employed, and has the usual opening or openings for the fire and ashpit doors, and also, if desired, with a handhole in its upper part, for affording access to the hot-air chamber and dry-pipe,hereinafter described. The rear wall, D, with itsflanges, as described, affords a solid bed or support for the forward end of the boiler, and being, like the upper arching portion of the fire-pot, secured thereto by bolts, the boiler and firepot can be readily separated for removal or transportation by simply removing the bolts.

The upper arching portion of the fire-pot shell may be made in one piece with the side walls thereof, if desired; but I prefer to make the side walls, where they extend at the rear beyond said upper portion, separate therefrom and riveting or bolting them thereto, as by the latter construction, I save cutting away the metal for shortening the upper portion, and where said parts are bolted together they may be readily separated, facilitating their transportation in mountainous regions. The firepot thus constructed is provided with linings of fire-brick or tiling, or it may be of iron plates or other suitable material arranged to cover the front and rear plates, D D, and the rivets connecting the tube-sheet with the shell of the boiler. These are represented at e and c, and are shown in the presentinstance as made of plates of iron or other suitable material, bolted or otherwise detachably secured to the front and rear walls in such manner as to leave an air-space between them and said walls. Where fire-brick or tile of sufiicient thickness to cover the joints and rivets is employed these air-spaces may be omitted.

For the side walls of the fire-pot, or the lower portion of them, which would otherwise be in direct contact with the fire, I prefer a lining of fire-brick with the upper part of said walls covered, by removable plates of iron or fireclay tile, and upon the upper edges of these, above the boiler-tubes, is placed a horizontal crown-sheet of fire-clay tiling, E, which serves to cut oil" the arched portion of the shell from the fire-pot, and to form a hot-air chamber, F, over the same, as shown. The tube-sheet is perforated above said diaphragm or crownsheet E, and has a horizontal pipe, G, secured in said perforation, said pipe passing from the steam-chamber or upper part of the boiler, above the water-line, through the tube-sheet into the hot-air chamber above said crownsheet E, and is closed at its inner end and perforated on its upper side within the steamchamber, to permit the entrance of the steam, forming what is termed a dry pipe. The

outer end of this pipe has an extension coupled to it, which passes horizontally through the hot-air chamber F two-thirds its length, more or less,and there has coupled to it by an elbow a vertical pipe passing through the shell 0 of the fire-pot, as shown, this arrangement of passing it through the hot-air chamber F serving to superheat the steam.

By the construction described the boiler and fire-box may not only be readily separated for transportation and reunited, when desired, without the aid of skilled labor, but the firebox, which is usually the heaviest and most unwieldy part of a portable boiler, may itself be readily taken to pieces and its linings removed, adapting the parts to be packed into compact shape for transportation, and afterward readily put together again by the same unskilled labor referred to.

The fire-box, it will be seen, is made nonsteam-generating, and consequently no nice fitting ofjoints is required, such as would be necessary to insure a proper circulation of wa-' ter and steam were a steam-generating fire-pot employed.

Having now described my invention, I claim- 1. A horizontal portable boiler provided with the projecting flanged tube-sheet, in combination with the detachable non-steam-gencrating fire-pot adapted to overlap said tubesheet, and provided with the removable linings and crown-sheet, covering and protecting the joints between the fire-pot and boiler, all arranged substantially as and for the purpose described.

2. The detachable fire-pot provided with the hot-air chamber in its upper part formed by the removable crown-sheet, in combination with the dry pipe from the steam-chamber, passing through said hot-air chamber and forming a superheater, substantially as described.

In testimony whereof I have hereunto set my hand this 15th day of July, A. D. 1881.

GEO. SELDEN.

Witnesses:

ALEX. MAHON, J. M. YZNAGA. 

